1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Fed [463]
4 years ago
13

A 5.0 g sample of calcium nitrate (Ca(NO3)2, M = 164) contaminated with silica (SiO2, M = 60.1) is found to contain 1.0 g calciu

m. What is the mass percent purity of calcium nitrate in the sample?
Chemistry
1 answer:
zhenek [66]4 years ago
4 0

Answer:

= 82%

Explanation:

Percentage purity is calculated by the formula;

% purity = (mass of pure chemical/total mass of sample) × 100

In this case;

1 mole of Ca(NO3)2 = 164 g

but; 164 g of Ca(NO3)2 = 40 g Ca

Therefore; mass of Ca(NO3)2 = 164 /40

                                                  = 4.1 g

Thus;

% purity of Ca(NO3)2 = (Mass of Ca(NO3)2/ mass of the sample)× 100

                                    = (4.1 g/ 5 g) × 100

                                    = 82%

You might be interested in
It takes 120 mL of 0.15 M of carbonic acid (H2CO3) to neutralize 300 mL of sodium hydroxide (NaOH) for the following balanced ch
Tju [1.3M]
First of all, you need to convert mL to L; 120mL = 0.12L, 300mL = 0.3L.

n (moles of carbonic acid) = C (concentration) x V (volume)
n = 0.15M (0.15 mol L-1) x 0.12L
n = 0.018 mol

C (conc. of NaOH) = 0.018 mol x 2 moles (because there’s 2x NaOH) = 0.036 mol
C = n / V
C = 0.036 mol / 0.3 L
C = 0.12 mol L-1
6 0
2 years ago
Evaluate (754 mm )/(43 s ) to three significant figures and express answer in si units using an appropriate prefix.
muminat

solution:

According to the question we need to convert it into SI units.

= 754 mm / 43 s

= 754 * 10 ^ -3 m / 43 s

=0.017534 m/s


3 0
3 years ago
Latex, DNA, and cellulose are all examples of Question 11 options: A) natural polymers. B) natural monomers. C) monomers. D) syn
RoseWind [281]

Answer:

A) natural polymers

Explanation:

pls mark as brainliest

4 0
3 years ago
Read 2 more answers
If a body`s efficiency is 75% what does it mean?​
snow_tiger [21]

Answer: It’s producing 75% of it’s potential.

Example: If I were to be playing basketbal, and my body was working at 75%, then there is 25% of energy that I’m not using, making me worse than if I was using 100%.

6 0
3 years ago
Which organelle's function is CORRECTLY described?
laiz [17]
The correct answer is c.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone help me with this question??
    13·1 answer
  • What are the three domains of life?
    6·1 answer
  • 8. What is the molarity of a CsOH solution if 30.0 mL of the solution is neutralized by 26.4 mL 0.25 M HBr solution (Hint: Ma x
    8·2 answers
  • Which solution has the lowest pH? A. 1.0 M HNO2 B. 1.0 M CH3COOH C. 1.0 M HCOOH D. 1.0 M HNO3 E. 1.0 M HPO4–
    14·2 answers
  • 23592U + 10n → ____10n + 13956Ba + 9436Kr
    6·1 answer
  • What is the concentration of a 300 mL solution containing 0.27 mol of glucose?
    13·1 answer
  • True or False. Physical changes result in the formation of a new substance.
    8·1 answer
  • The stomach is an example of ....<br> a cell or a tissue or an organ or an organ system
    5·1 answer
  • How do i find the name of an element
    7·2 answers
  • Helium and methane gases are mixed together in a container. what is the ratio of their root-mean-square speeds, i. e. (vrms,heli
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!